Syntax highlighting breaks on a particular regex

[mattdeboard]

A coffeescript-ified version of this regex breaks syntax highlighting for me in emacs 24.4, coffee-mode 0.5.5 (as reported by M-x coffee-version):

            # daringfireball.net/2010/07/improved_regex_for_matching_urls
            # modifed to allow ftp urls
            # doesn't handle all our cases, but is good enough for now
            linkRegex = ///
                \b
                (                                      # Capture 1: entire matched URL
                  (?:
                    ftp|https?://                      # ftp or http or https protocol
                    |                                  #   or
                    www\d{0,3}[.]                      # "www.", "www1.", "www2." … "www999."
                    |                                  #   or
                    [a-z0-9.\-]+[.][a-z]{2,4}/         # looks like domain name followed by a slash
                  )
                  (?:                                  # One or more:
                    [^\s()<>]+                         # Run of non-space, non-()<>
                    |                                  #   or
                    \(([^\s()<>]+|(\([^\s()<>]+\)))*\) # balanced parens, up to 2 levels
                  )+
                  (?:                                  # End with:
                    \(([^\s()<>]+|(\([^\s()<>]+\)))*\) # balanced parens, up to 2 levels
                    |                                  #   or
                    [^\s`!()\[\]{};:'".,<>?«»“”‘’]     # not a space or one of these punct chars
                  )
                )
                ///gi

Thanks!

[syohex]

coffee-mode does not support block regexp yet.
We should support this feature(However its support is difficult, I have to get more
understanding of Emacs syntax highlighting).

[mattdeboard]

I'm the maintainer for elixir-mode, and one of the best resources I had for creating that mode's current syntax highlighting scheme is this excellent blog series by @lunaryorn, who maintains puppet-mode.

You should absolutely check it out! Extremely helpful.

[syohex]

Thanks for information.

[mattdeboard]

I've started chipping away at this here. I have highlighting working for block regexes except needing to really refine the parser so that in-line comments are still highlighted as comments instead of with font-lock-constant-face.

[sherrman]

Not sure if this is a separate issue, but it's also broken for a regex inside of a string interpolation block:

foo = "=HYPERLINK(\"#{url}\", \"#{text.replace(/"/g, "'")}\")"

The closing double quotes and parenthesis are both mistaken.

Edit: Simplified the problem, it's unrelated to regex: #285

[syohex]

I fixed breaking syntax highlighting issue.

Before

Current

It is good to highlight multiline regexp same as single line regexp
however it is too difficult for me with current design.